I would connect both ends to ground, although I don't know for certain if that's what Mr Wilson would advise, but that would be the standard thing to do when connecting equipment together with coax leads._________________As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"

Thanks. I don't know if Ray advises that, as I could not find it in his documentation. I was trying to avoid emailing him directly, partly to reduce his load, and partly, because the answer will probably benefit others here.

I will take your advice and connect the shield at both ends. I thought about it as I read your reply, and if I am not happy with the results, I can always disconnect one end, and/or the other. I assume Ray's recommendation to use coax is to reduce noise, so I will report back when I have tested.

Nobody should hold their breath on an update though, this is in my backlog, and may still be months from completion. I tend to get bogged down at the front panel layout stage.

Thanks. Well Ray recommends use of coax, explicitly in his doc, and I don't think I have ever seen him mention it elsewhere.

So, since I have some here, I will use that, and maybe follow your suggestion and only connect one end of the shield. Having the shielded cable shouldn't be detrimental, and I can always connect the second end of the shield or disconnect the first - that is easier than replacing the whole cable if I start with plain hookup.

I assume there must be something about this part of the circuit which is particularly susceptible to induced noise or something.

For general module wiring, I just use stranded Cat-5E cable with the sheath removed, and I haven't experienced any problems - well, none that my untrained ears can detect. I just have a lot of it, and the multiple colours help when making the connections.

if i understand correctly, thats not how ground loops work. can we get a diagram of the connection being made?_________________As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"

Ray is recommending coax between the input jack and the 100k audio input attenuator pot (sig in one side, ground the other side, sig out fro the wiper), and from the wiper to the board, where it enters at point X6 about 2/3 down on the left side of the schematic linked above.

and Ray is usually very thorough. However, with my limited knowledge, I do not understand how coax with the outer shield just 'floating' would help.

Yeah - if you don't ground it at all, it's kind of pointless. I don't typically bother with Coax on my stuff, but if I do I take a small piece of stranded wire and solder it to the coax shield, and then heatshrink around that. That makes it easy to attach the shield to a ground lug on the panel.

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